Which one of the following disease is not caused by bacteria?

Options

A. BSE (Bovine-Spongiform Encephalopathies)
B. Kuru disease
C. CJD(Creutzfeldt-Jakob disease)
D. PSTD(Potato Spindle Tuber Disease)

Answer

To determine which disease is not caused by bacteria, we can analyze each option provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the diseases listed in the question
The diseases mentioned are:
1. BSC (Bovine Spongiform Encephalopathy)
2. Kuru disease
3. CJD (Creutzfeldt-Jakob Disease)
4. PSTD (Potato Spindle Tuber Disease)

### Step 2: Research the causative agents of each disease
- **BSC (Bovine Spongiform Encephalopathy)**: This disease, also known as mad cow disease, is caused by prions, which are infectious proteins that lead to neurological disorders in cattle.

- **Kuru disease**: This is a neurodegenerative disorder caused by prions, specifically linked to cannibalistic practices in certain cultures.

- **CJD (Creutzfeldt-Jakob Disease)**: Similar to Kuru, CJD is also caused by prions and leads to severe neurological degeneration in humans.

- **PSTD (Potato Spindle Tuber Disease)**: This disease is caused by viroids, which are infectious RNA molecules that do not have a protein coat.

### Step 3: Analyze the causative agents
From the analysis:
- BSC, Kuru, and CJD are caused by prions.
- PSTD is caused by viroids.

### Step 4: Conclusion
None of the diseases listed (BSC, Kuru, CJD, PSTD) are caused by bacteria. They are caused by either prions or viroids.

### Final Answer
**None of the diseases listed (BSC, Kuru, CJD, PSTD) are caused by bacteria.**

---